Goober
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A 750 Massey has a 50" cylinder and was powered by a 372 cid Perkins diesel or a 354 cid turbo Perkins. They were built from 74IJ till 1980. The grey cab model came out in about 79 and the major difference was they had the new 14 channel monitor system in the cab. A 760 Massey has a 60" cylinder and was powered by the 354 turbo Perkins or 540 V8 Perkins it is of the same era of the 750.When the 760 came out and for a few years it was the largest production combine built (in North America anyway). A 850 Massey came out in 81 and was basically the same combine as a gray cab 750 except the straw walkers were 13" longer. And as the years progressed new options were added each year. By the end of production in 87 it was quite a nice machine. A 860 Massey is the same as the gray cab 760 except the straw walkers are also 13" longer. The 860 combine would still compete today with most machines out there if they would have given it a better engine with about 50-60 more HP and beefed up a few areas. Then there is the 751 a pto version of the 750 The 755, a few of these combines were built for the European market, they were prototype of the 850. The 851 is a pto version of the 850. Then the 852 also a pto version of the 850 with more goodies. The 855 Massey is basically a 850 with a cascade seperator in the back end under the rear end of the straw walkers to beat out any grain that may have gone over the walkers. ( It is a wonder that John Deere didn't steal this idea from Massey too). The 865 is basically a 860 with the cascade seperator in the back end also. As for as options they had almost everything available on the 750_760's that is available today except laterial tilt of thr header.